Malicious PDF — malware analysis report

Static analysis result for SHA-256 1387331d7e88009e…

MALICIOUS

PDF

68.6 KB Created: 2020-11-18 12:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 830bcd281815713e5135f450653fb9ab SHA-1: 9361c8f2e47aed6299fedc32372dbafe64914067 SHA-256: 1387331d7e88009e717c2ad0ec94d9e783be6c4d9bb4ad95e501c845871511e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffking.ru/strik?utm_term=dil+se+re+song+mp3+download PDF link annotation
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/9d26b8b8.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/2855382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5f9ceac21aff7.pdfIn PDF document text
    • https://lifusapemar.weebly.com/uploads/1/3/4/5/134526201/jufadupuwivijom.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/zadoniko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451556/normal_5fafa2efe62ac.pdfIn PDF document text
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/favav.pdfIn PDF document text
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/jofuwew.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/c04e75661.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/5b54da0d0.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/pebeg.pdfIn PDF document text
    • https://xoselobukakuri.weebly.com/uploads/1/3/4/4/134498653/zurova_motipolopu_dotimariki_wunofinawez.pdfIn PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/264334a.pdfIn PDF document text
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/logiworis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/76302040988.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 5536 bytes
SHA-256: cb63d952e38e1f956627fb22ca1bf4119bb9e2243308fa318c97a9f2c5deea24
font_01_sfnt_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 10864 bytes
SHA-256: a4acaffd8a0fc42218ea9f5933cbd2dfb7b7ff70856b3159997396c09f1bc2e6

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